How to create your own "Google map" at home?

Question

satellite navigation

Good day to all. I am very interested in such a thing: how to create, for example, from your router your own three-dimensional grid of coordinates with an accuracy of up to cm? Those. for example, so that I can find out how far my gadget connected to this network is from the router. Google maps will not help here, because the error is very large.
Give something to read or explain

Answer 1

Google finds the location via wifi, but they have it predetermined based on the readings of GPS sensors from gadgets. That is, a conditional neighbor from the gadget transmits GPS coordinates and wifi data to Google, and when you then look at IP, in fact, these neighbor data about you are provided.
It's almost impossible to do it yourself.